[SalesForce] FirstPublishLocationId empty after new File version

Try the following method, it will work lightning pages but it won't work in communities. For communities you need to use standard__recordPage as standard_namedPage won't work.

I have used Lightning button in html file and onclick call the following method.

handleFilePreView(event){
  this[NavigationMixin.Navigate]({
            type: 'standard__namedPage',
            attributes: {
                pageName: 'filePreview',
                recordId: event.target.value,
                objectApiName: 'ContentVersion',
                actionName: 'view',
            },
            state: {
                selectedRecordId: event.target.value,
            },
        });
}

Partner support have replied to me and provided a working solution!

Follow this tutorial https://developer.salesforce.com/blogs/developer-relations/2017/05/build-lightning-file-uploader-component.html but change the file upload apex class to 'without sharing'. Then embed the component within a flow following from the record creation passing through the new record id into the recordId attribute (I did it through a design attribute).

For now this will upload to notes & attachments rather than files but I assume a process builder or other solution could move it over if required.

Partner support does note that: ">>If you want to try this, another thing to keep in mind is the entry point of the Apex without sharing logic should be protected by some secure access code, for ex. an encrypted record id. "